Sift almond flour and powdered sugar together. In separate bowl, beat egg whites, adding the granulated sugar a little at a time. Beat until egg whites hold a stiff peak. Use spatula to gently fold in almond flour mixture until completely incorporated. Don't worry when it goes down in size.

Meanwhile, put oven racks in upper and lower thirds of oven and preheat oven to 300°F.

Bake cookies, switching position of sheets halfway through baking, until crisp and edges are just slightly darker, 20 to 25 minutes. Cool completely on sheets on racks, about 30 minutes. When finished, spread a thin layer of nutella (about a teaspoon) on half of them make sandwiches!

xoxo Mariko!"

Want more from Mariko? Follow her on Twitter and Facebook– and if U wanna know more about 4 ingredient recipes OR anything else, U can always email us at Questions@FitPerez.com!!